Question 66200
MOST DIRECT SOLUTION IS TO MAKE A TABLE THUS
///15C///10C///5C///=45C
--------------------------------------
///QTY///QTY//QTY///=PRICE
////3/////0////0////=45
////2/////1////1////=45
////2/////0////3////=45
////1/////3////0////=45
////1/////2////2////=45
////1/////0////4////=45
////0/////4////1////=45
////0/////3////3////=45
////0/////2////5////=45
////0/////1////7////=45
////0/////0////9////=45